Merge branch 'wip/diskio'

27 files changed, 414 insertions, 8 deletions

diff --git a/.gitignore b/.gitignore
index b4738458..5446f725 100644
--- a/.gitignore
+++ b/.gitignore
@@ -70,6 +70,7 @@ examples/smp
 examples/sysdeps
 examples/timings
 examples/wd
+examples/diskio
 gtk-doc.make
 install-sh
 lib/GTop-2.0.gir
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 48ac4849..25585e04 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -11,7 +11,7 @@ AM_LDFLAGS			= $(LIBGTOP_EXTRA_LIBS)
 
 noinst_PROGRAMS	= 	first second pprint procargs df netlist \
 			  mountlist procmap netload sysdeps timings \
-			  openfiles smp proclist free wd affinity
+			  openfiles smp proclist free wd affinity diskio
 
 first_SOURCES		= first.c
 first_LDADD		= $(top_builddir)/lib/libgtop-2.0.la
@@ -43,6 +43,7 @@ pprint_LDADD		= $(top_builddir)/lib/libgtop-2.0.la
 procargs_SOURCES	  = procargs.c
 procargs_LDADD		  = $(top_builddir)/lib/libgtop-2.0.la
 
+
 df_SOURCES	  = df.c
 df_LDADD		  = $(top_builddir)/lib/libgtop-2.0.la
 
@@ -63,3 +64,6 @@ free_LDADD	= $(top_builddir)/lib/libgtop-2.0.la
 
 affinity_SOURCES	= affinity.c
 affinity_LDADD	= $(top_builddir)/lib/libgtop-2.0.la
+
+diskio_SOURCES	  = diskio.c
+diskio_LDADD	  = $(top_builddir)/lib/libgtop-2.0.la
diff --git a/examples/diskio.c b/examples/diskio.c
new file mode 100644
index 00000000..de6d775c
--- /dev/null
+++ b/examples/diskio.c
@@ -0,0 +1,39 @@
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <glibtop.h>
+#include <glibtop/procio.h>
+
+#include <stdlib.h>
+
+#include <unistd.h>
+
+static void show_diskio(pid_t pid)
+{
+  glibtop_proc_io io;
+
+  glibtop_get_proc_io (&io, pid);
+
+  printf("<%ld>\t", (long)pid);
+
+  printf("flags: %08lx disk_rchar : %lu, disk_wchar : %lu, disk_read_bytes : %lu, disk_write_bytes : %lu\n", (unsigned long)io.flags, io.disk_rchar, io.disk_wchar, io.disk_rbytes, io.disk_wbytes);
+
+}
+
+
+int main(int argc, char **argv)
+{
+  glibtop_init();
+
+  while(*++argv)
+    {
+      pid_t pid = strtol(*argv, NULL, 10);
+      show_diskio(pid);
+    }
+
+  glibtop_close();
+
+  return 0;
+}
+
diff --git a/examples/sysdeps.c b/examples/sysdeps.c
index 5d55142c..559f93ef 100644
--- a/examples/sysdeps.c
+++ b/examples/sysdeps.c
@@ -92,9 +92,10 @@ main (int argc, char *argv [])
 		"\tproc_time:\t%d\t0x%08lx\n"
 		"\tproc_signal:\t%d\t0x%08lx\n"
 		"\tproc_kernel:\t%d\t0x%08lx\n"
-		"\tproc_segment:\t%d\t0x%08lx\n\n"
+		"\tproc_segment:\t%d\t0x%08lx\n"
 		"\tproc_args:\t%d\t0x%08lx\n"
-		"\tproc_map:\t%d\t0x%08lx\n\n"
+		"\tproc_map:\t%d\t0x%08lx\n"
+		"\tproc_io:\t%d\t0x%08lx\n\n"
 		"\tmountlist:\t%d\t0x%08lx\n"
 		"\tfsusage:\t%d\t0x%08lx\n\n"
 		"\tnetload:\t%d\t0x%08lx\n"
@@ -137,6 +138,8 @@ main (int argc, char *argv [])
 		(unsigned long) sysdeps.proc_args,
 		FEATURE_CHECK(PROC_MAP),
 		(unsigned long) sysdeps.proc_map,
+		FEATURE_CHECK(PROC_IO),
+		(unsigned long) sysdeps.proc_io,
 		FEATURE_CHECK(MOUNTLIST),
 		(unsigned long) sysdeps.mountlist,
 		FEATURE_CHECK(FSUSAGE),
diff --git a/examples/timings.c b/examples/timings.c
index 6c85da0f..15bc1973 100644
--- a/examples/timings.c
+++ b/examples/timings.c
@@ -412,6 +412,26 @@ main (int argc, char *argv [])
 		(long double) ELAPSED_UTIME / PROFILE_COUNT,
 		(long double) ELAPSED_STIME / PROFILE_COUNT);
 
+
+	getrusage (RUSAGE_SELF, &rusage_start);
+
+	for (c = 0; c < PROFILE_COUNT; c++)
+		glibtop_get_proc_io (&data.proc_io, pid);
+
+	getrusage (RUSAGE_SELF, &rusage_end);
+
+	libgtop_timersub (&rusage_end.ru_utime, &rusage_start.ru_utime,
+			  &elapsed_utime);
+
+	libgtop_timersub (&rusage_end.ru_stime, &rusage_start.ru_stime,
+			  &elapsed_stime);
+
+	printf ("Proc_Io  (0x%08lx): %7lu - %9.2Lf - %9.2Lf\n",
+		(unsigned long) data.proc_io.flags, PROFILE_COUNT,
+		(long double) ELAPSED_UTIME / PROFILE_COUNT,
+		(long double) ELAPSED_STIME / PROFILE_COUNT);
+
+
 	getrusage (RUSAGE_SELF, &total_end);
 
 	libgtop_timersub (&total_end.ru_utime, &total_start.ru_utime,
diff --git a/features.def b/features.def
index 1025313e..faab87b1 100644
--- a/features.def
+++ b/features.def
@@ -24,4 +24,5 @@ void|ppp|ushort(device)
 char **|netlist
 char **|proc_wd|pid_t(pid)
 guint16*|proc_affinity|pid_t(pid)
+void|proc_io|pid_t(pid)
 
diff --git a/include/glibtop/Makefile.am b/include/glibtop/Makefile.am
index 66bdd344..6d0e055f 100644
--- a/include/glibtop/Makefile.am
+++ b/include/glibtop/Makefile.am
@@ -9,6 +9,7 @@ glibtop_HEADERS		= close.h loadavg.h prockernel.h procstate.h \
 			  parameter.h mountlist.h fsusage.h procmap.h signal.h \
 			  sysinfo.h ppp.h procargs.h netload.h \
 			  procwd.h procaffinity.h \
+              procio.h \
 			  netlist.h procopenfiles.h open.h
 
 noinst_HEADERS		= error.h write.h read_data.h read.h init_hooks.h machine.h \
diff --git a/include/glibtop/command.h b/include/glibtop/command.h
index 1d4d630c..9a0e47b1 100644
--- a/include/glibtop/command.h
+++ b/include/glibtop/command.h
@@ -59,8 +59,9 @@ G_BEGIN_DECLS
 #define GLIBTOP_CMND_PROC_OPEN_FILES	25
 #define GLIBTOP_CMND_PROC_WD		26
 #define GLIBTOP_CMND_PROC_AFFINITY	27
+#define GLIBTOP_CMND_PROC_IO	28
 
-#define GLIBTOP_MAX_CMND		28
+#define GLIBTOP_MAX_CMND		29
 
 #define _GLIBTOP_PARAM_SIZE		16
 
diff --git a/include/glibtop/procio.h b/include/glibtop/procio.h
new file mode 100644
index 00000000..86c06e5d
--- /dev/null
+++ b/include/glibtop/procio.h
@@ -0,0 +1,93 @@
+/* Copyright (C) 2017 Robert Roth
+   This file is part of LibGTop.
+
+   Contributed by Robert Roth <robert.roth.off@gmail.com>, February 2017.
+
+   LibGTop is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License,
+   or (at your option) any later version.
+
+   LibGTop is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with LibGTop; see the file COPYING. If not, write to the
+   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#ifndef __GLIBTOP_PROCIO_H__
+#define __GLIBTOP_PROCIO_H__
+
+#include <glibtop.h>
+#include <glibtop/global.h>
+
+G_BEGIN_DECLS
+
+#define GLIBTOP_PROC_IO_DISK_RCHAR	0
+#define GLIBTOP_PROC_IO_DISK_WCHAR	1
+#define GLIBTOP_PROC_IO_DISK_RBYTES	2
+#define GLIBTOP_PROC_IO_DISK_WBYTES	3
+
+#define GLIBTOP_MAX_PROC_IO		3
+
+typedef struct _glibtop_proc_io	glibtop_proc_io;
+
+/* Time section */
+
+/**
+ * glibtop_proc_io:
+ * @disk_rchar: The number of bytes which this task has caused to be read from storage. This
+ * is simply the sum of bytes which this process passed to read() and pread(), also including tty IO,
+ * and it is unaffected by whether or not actual physical disk IO was required.
+ * @disk_wchar: The number of bytes which this task has caused, or shall cause to be written
+ * to disk. Similar caveats apply here as with rchar.
+ * @disk_rbytes: Attempt to count the number of bytes which this process really did cause to
+ * be fetched from the storage layer. Done at the submit_bio() level, so it is
+ * accurate for block-backed filesystems.
+ * @disk_wbytes: Attempt to count the number of bytes which this process caused to be sent to
+ * the storage layer. This is done at page-dirtying time.
+ *
+ * Process disk io data filled by glibtop_get_proc_io().
+ *
+ */
+struct _glibtop_proc_io
+{
+    /*< private >*/
+	guint64	flags;
+	/*< public >*/
+	guint64 disk_rchar;
+	guint64 disk_wchar;
+	guint64 disk_rbytes;
+	guint64 disk_wbytes;
+
+    /* reserved for future extensions, e.g. per-process netio */
+    guint64 reserved[10];
+};
+
+
+void glibtop_get_proc_io (glibtop_proc_io *buf, pid_t pid);
+
+#if GLIBTOP_SUID_PROC_IO
+#define glibtop_get_proc_io_r	glibtop_get_proc_io_p
+#else
+#define glibtop_get_proc_io_r	glibtop_get_proc_io_s
+#endif
+
+void glibtop_get_proc_io_l (glibtop *server, glibtop_proc_io *buf, pid_t pid);
+
+#if GLIBTOP_SUID_PROC_IO
+void _glibtop_init_proc_io_p (glibtop *server);
+void glibtop_get_proc_io_p (glibtop *server, glibtop_proc_io *buf, pid_t pid);
+#else
+void _glibtop_init_proc_io_s (glibtop *server);
+void glibtop_get_proc_io_s (glibtop *server, glibtop_proc_io *buf, pid_t pid);
+#endif
+
+
+G_END_DECLS
+
+#endif
diff --git a/include/glibtop/sysdeps.h b/include/glibtop/sysdeps.h
index 61006a0a..6b5682df 100644
--- a/include/glibtop/sysdeps.h
+++ b/include/glibtop/sysdeps.h
@@ -53,8 +53,9 @@ G_BEGIN_DECLS
 #define GLIBTOP_SYSDEPS_PROC_OPEN_FILES	24
 #define GLIBTOP_SYSDEPS_PROC_WD		25
 #define GLIBTOP_SYSDEPS_PROC_AFFINITY	26
+#define GLIBTOP_SYSDEPS_PROC_IO	27
 
-#define GLIBTOP_MAX_SYSDEPS		27
+#define GLIBTOP_MAX_SYSDEPS		28
 
 /* The 'features' args to glibtop_init_* is an unsigned long */
 G_STATIC_ASSERT((1UL << (GLIBTOP_MAX_SYSDEPS - 1)) <= ULONG_MAX);
@@ -93,6 +94,7 @@ struct _glibtop_sysdeps
 	guint64 ppp;			/* glibtop_ppp		*/
 	guint64	proc_wd;		/* glibtop_proc_wd	*/
 	guint64	proc_affinity;		/* glibtop_proc_affinity */
+	guint64	proc_io;		/* glibtop_proc_io */
 };
 
 void glibtop_get_sysdeps (glibtop_sysdeps *buf);
diff --git a/include/glibtop/union.h b/include/glibtop/union.h
index a140d71a..334f0217 100644
--- a/include/glibtop/union.h
+++ b/include/glibtop/union.h
@@ -44,6 +44,7 @@
 #include <glibtop/procopenfiles.h>
 #include <glibtop/procwd.h>
 #include <glibtop/procaffinity.h>
+#include <glibtop/procio.h>
 
 #include <glibtop/mountlist.h>
 #include <glibtop/fsusage.h>
@@ -84,6 +85,7 @@ union _glibtop_union
 	glibtop_proc_open_files proc_open_files;
 	glibtop_proc_wd		proc_wd;
 	glibtop_proc_affinity	proc_affinity;
+	glibtop_proc_io	proc_io;
 };
 
 G_END_DECLS
diff --git a/lib/Makefile.am b/lib/Makefile.am
index dec24a04..90b82861 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -35,7 +35,7 @@ introspection_sources = $(libgtop_2_0_la_SOURCES) lib.c ../glibtop.h ../libgtopc
 			../include/glibtop/procsignal.h ../include/glibtop/union.h ../include/glibtop/gnuserv.h \
 			../include/glibtop/parameter.h ../include/glibtop/mountlist.h ../include/glibtop/fsusage.h ../include/glibtop/procmap.h ../include/glibtop/signal.h \
 			../include/glibtop/sysinfo.h ../include/glibtop/ppp.h ../include/glibtop/procargs.h ../include/glibtop/netload.h \
-			../include/glibtop/procwd.h ../include/glibtop/procaffinity.h \
+			../include/glibtop/procwd.h ../include/glibtop/procaffinity.h ../include/glibtop/procio.h \
 			../include/glibtop/netlist.h ../include/glibtop/procopenfiles.h ../include/glibtop/open.h
 
 GTop-2.0.gir: libgtop-2.0.la
diff --git a/lib/command.c b/lib/command.c
index 414081c3..b6ccf1f2 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -68,6 +68,7 @@ glibtop_call_l (glibtop *server, unsigned command, size_t send_size,
 	  CHECK_CMND(GLIBTOP_CMND_PROC_OPEN_FILES);
 	  CHECK_CMND(GLIBTOP_CMND_PROC_WD);
 	  CHECK_CMND(GLIBTOP_CMND_PROC_AFFINITY);
+	  CHECK_CMND(GLIBTOP_CMND_PROC_IO);
 	default:
 	  glibtop_error_r(server, "CALL: command UNKNOWN(%d) sending %lu bytes", command, (unsigned long)send_size); break;
 	}
diff --git a/lib/libgtop.sym b/lib/libgtop.sym
index d15adcc6..afa9d070 100644
--- a/lib/libgtop.sym
+++ b/lib/libgtop.sym
@@ -52,6 +52,8 @@ glibtop_get_shm_limits
 glibtop_get_shm_limits_l
 glibtop_get_proc_affinity
 glibtop_get_proc_affinity_l
+glibtop_get_proc_io
+glibtop_get_proc_io_l
 glibtop_get_swap
 glibtop_get_swap_l
 glibtop_get_sysdeps
diff --git a/lib/sysdeps.c b/lib/sysdeps.c
index 3a90a54c..e942fd4a 100644
--- a/lib/sysdeps.c
+++ b/lib/sysdeps.c
@@ -48,7 +48,8 @@ GLIBTOP_SUID_NETLOAD +
 GLIBTOP_SUID_NETLIST +
 GLIBTOP_SUID_PROC_WD +
 GLIBTOP_SUID_PROC_AFFINITY +
-GLIBTOP_SUID_PPP;
+GLIBTOP_SUID_PPP +
+GLIBTOP_SUID_PROC_IO;
 
 const _glibtop_init_func_t _glibtop_init_hook_s [] = {
 #if !GLIBTOP_SUID_CPU
@@ -120,6 +121,9 @@ const _glibtop_init_func_t _glibtop_init_hook_s [] = {
 #if !GLIBTOP_SUID_PPP
 	_glibtop_init_ppp_s,
 #endif
+#if !GLIBTOP_SUID_PROC_IO
+	_glibtop_init_proc_io_s,
+#endif
 	NULL
 };
 
@@ -193,6 +197,9 @@ const _glibtop_init_func_t _glibtop_init_hook_p [] = {
 #if GLIBTOP_SUID_PPP
 	_glibtop_init_ppp_p,
 #endif
+#if GLIBTOP_SUID_PROC_IO
+	_glibtop_init_proc_io_p,
+#endif
 	NULL
 };
 
diff --git a/src/daemon/main.c b/src/daemon/main.c
index 11364229..b51addf6 100644
--- a/src/daemon/main.c
+++ b/src/daemon/main.c
@@ -221,6 +221,12 @@ handle_parent_connection (int s)
 	    do_output (s, resp, _offset_data (fsusage),
 		       0, NULL);
 	    break;
+    case GLIBTOP_CMND_PROC_IO:
+	    glibtop_get_proc_io_l
+		(server, &resp->u.data.proc_io, parameter);
+	    do_output (s, resp, _offset_data (proc_io),
+		       0, NULL);
+	    break;
 	case GLIBTOP_CMND_PPP:
 	    memcpy (&device, parameter, sizeof (device));
 	    glibtop_get_ppp_l
diff --git a/src/daemon/slave.c b/src/daemon/slave.c
index 2858ee8a..e15f1efc 100644
--- a/src/daemon/slave.c
+++ b/src/daemon/slave.c
@@ -209,6 +209,14 @@ handle_slave_command (glibtop_command *cmnd, glibtop_response *resp,
 		resp->offset = _offset_data (proc_time);
 		break;
 #endif
+#if GLIBTOP_SUID_PROC_IO
+	case GLIBTOP_CMND_PROC_IO:
+		memcpy (&pid, parameter, sizeof (pid_t));
+		glibtop_get_proc_io_p
+			(server, &resp->u.data.proc_io, pid);
+		resp->offset = _offset_data (proc_time);
+		break;
+#endif
 #if GLIBTOP_SUID_PROC_SIGNAL
 	case GLIBTOP_CMND_PROC_SIGNAL:
 		memcpy (&pid, parameter, sizeof (pid_t));
diff --git a/sysdeps/common/default.c b/sysdeps/common/default.c
index 2df25ee6..e3b096f2 100644
--- a/sysdeps/common/default.c
+++ b/sysdeps/common/default.c
@@ -431,3 +431,18 @@ glibtop_get_proc_affinity(glibtop_proc_affinity *buf, pid_t pid)
 {
 	return glibtop_get_proc_affinity_l(glibtop_global_server, buf, pid);
 }
+
+/**
+ * glibtop_get_proc_io: Get the io stats for the given pid
+ * @buf: Buffer where the result will be given
+ * @pid: Process id to get the io stats for
+ *
+ * Get the io stats for a process
+ *
+ * Returns: A list of processor ID of 'buf.number' elements.
+ */
+void
+glibtop_get_proc_io(glibtop_proc_io *buf, pid_t pid)
+{
+	return glibtop_get_proc_io_l(glibtop_global_server, buf, pid);
+}
diff --git a/sysdeps/common/sysdeps_suid.c b/sysdeps/common/sysdeps_suid.c
index 91ff806c..24953176 100644
--- a/sysdeps/common/sysdeps_suid.c
+++ b/sysdeps/common/sysdeps_suid.c
@@ -90,6 +90,9 @@ const _glibtop_init_func_t _glibtop_init_hook_p [] = {
 #if GLIBTOP_SUID_PPP
 	_glibtop_init_ppp_p,
 #endif
+#if GLIBTOP_SUID_PROC_IO
+	_glibtop_init_proc_io_p,
+#endif
 	NULL
 };
 
diff --git a/sysdeps/freebsd/Makefile.am b/sysdeps/freebsd/Makefile.am
index 6bd15894..7cacb707 100644
--- a/sysdeps/freebsd/Makefile.am
+++ b/sysdeps/freebsd/Makefile.am
@@ -16,6 +16,7 @@ libgtop_sysdeps_suid_2_0_la_SOURCES	= suid_open.c close.c swap.c \
 				  proclist.c procstate.c procuid.c \
 				  proctime.c procmem.c procsignal.c \
 				  prockernel.c procsegment.c procargs.c \
+				  procio.c \
 				  procmap.c netload.c ppp.c
 
 libgtop_sysdeps_suid_2_0_la_LDFLAGS	= $(LT_VERSION_INFO)
diff --git a/sysdeps/freebsd/glibtop_server.h b/sysdeps/freebsd/glibtop_server.h
index d9ea12d6..d908ea7c 100644
--- a/sysdeps/freebsd/glibtop_server.h
+++ b/sysdeps/freebsd/glibtop_server.h
@@ -47,6 +47,7 @@ G_BEGIN_DECLS
 #define GLIBTOP_SUID_NETLIST		0
 #define GLIBTOP_SUID_PROC_WD		0
 #define GLIBTOP_SUID_PROC_AFFINITY	0
+#define GLIBTOP_SUID_PROC_IO	(1 << GLIBTOP_SYSDEPS_PROC_IO)
 
 G_END_DECLS
 
diff --git a/sysdeps/freebsd/procio.c b/sysdeps/freebsd/procio.c
new file mode 100644
index 00000000..0525a2a7
--- /dev/null
+++ b/sysdeps/freebsd/procio.c
@@ -0,0 +1,80 @@
+/* Copyright (C) 2017 Robert Roth
+   This file is part of LibGTop.
+
+   Contributed by Robert Roth <robert.roth.off@gmail.com>, February 2017.
+
+   LibGTop is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License,
+   or (at your option) any later version.
+
+   LibGTop is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with LibGTop; see the file COPYING. If not, write to the
+   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#include <config.h>
+#include <glibtop.h>
+#include <glibtop/procio.h>
+#include <glibtop/error.h>
+#include <glibtop_suid.h>
+
+static const unsigned long _glibtop_sysdeps_proc_io =
+  (1UL << GLIBTOP_PROC_IO_DISK_RBYTES) + (1UL << GLIBTOP_PROC_IO_DISK_WBYTES);
+
+/* Init function. */
+
+void
+_glibtop_init_proc_io_p (glibtop *server)
+{
+	server->sysdeps.proc_io = _glibtop_sysdeps_proc_io;
+}
+
+/* Provides detailed information about a process. */
+
+void
+glibtop_get_proc_io_p (glibtop *server, glibtop_proc_io *buf,
+			 pid_t pid)
+{
+	memset (buf, 0, sizeof (glibtop_proc_io));
+
+	struct kinfo_proc *pinfo;
+	int count;
+
+	glibtop_suid_enter (server);
+
+	/* Get the process information */
+	pinfo = kvm_getprocs (server->machine->kd, KERN_PROC_PID, pid, &count);
+	if ((pinfo == NULL) || (count != 1)) {
+		glibtop_warn_io_r (server, "kvm_getprocs (%d)", pid);
+		glibtop_suid_leave (server);
+		return;
+	}
+
+	glibtop_suid_leave (server);
+
+	/* man getrusage
+
+	   long ru_inblock;         == block input operations
+	   long ru_oublock;         == block output operations
+
+	   ru_inblock   the number of times the file system had to perform input.
+	   ru_oublock   the number of times the file system had to perform output.
+
+	   And then it says 'account only for real IO'.
+
+	   But if I write 1MB in a process, I can see ru_oublock increased
+	   1024. So it's neither a number of operations or times.
+
+	   FIXME: seems the blocksize is 1024 but ...
+	*/
+	buf->disk_rbytes = pinfo->ki_rusage.ru_inblock << 10;
+	buf->disk_wbytes = pinfo->ki_rusage.ru_oublock << 10;
+	buf->flags = _glibtop_sysdeps_proc_io;
+}
diff --git a/sysdeps/linux/Makefile.am b/sysdeps/linux/Makefile.am
index ae480f1f..7baabe0b 100644
--- a/sysdeps/linux/Makefile.am
+++ b/sysdeps/linux/Makefile.am
@@ -10,7 +10,7 @@ libgtop_sysdeps_2_0_la_SOURCES	= open.c close.c cpu.c mem.c swap.c \
 				  proctime.c procmem.c procsignal.c prockernel.c \
 				  procsegment.c procargs.c procmap.c siglist.c \
 				  sysinfo.c netload.c ppp.c glibtop_private.c \
-				  mountlist.c  procaffinity.c \
+				  mountlist.c  procaffinity.c procio.c \
 				  fsusage.c netlist.c procopenfiles.c procwd.c
 
 libgtop_sysdeps_2_0_la_LIBADD	=  @GLIB_LIBS@
diff --git a/sysdeps/linux/glibtop_server.h b/sysdeps/linux/glibtop_server.h
index 5912ad05..8e591eab 100644
--- a/sysdeps/linux/glibtop_server.h
+++ b/sysdeps/linux/glibtop_server.h
@@ -46,5 +46,6 @@
 #define GLIBTOP_SUID_PROC_AFFINITY	0
 #define GLIBTOP_SUID_PPP		0
 #define GLIBTOP_SUID_PROC_FILE		0
+#define GLIBTOP_SUID_PROC_IO	0
 
 #endif /* __LINUX__GLIBTOP_SERVER_H__ */
diff --git a/sysdeps/linux/procio.c b/sysdeps/linux/procio.c
new file mode 100644
index 00000000..2240022f
--- /dev/null
+++ b/sysdeps/linux/procio.c
@@ -0,0 +1,70 @@
+/* Copyright (C) 2017 Robert Roth
+   This file is part of LibGTop.
+
+   Contributed by Robert Roth <robert.roth.off@gmail.com>, February 2017.
+
+   LibGTop is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License,
+   or (at your option) any later version.
+
+   LibGTop is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with LibGTop; see the file COPYING. If not, write to the
+   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#include <config.h>
+#include <glibtop.h>
+#include <glibtop/error.h>
+#include <glibtop/procio.h>
+
+#include "glibtop_private.h"
+
+static const unsigned long _glibtop_sysdeps_proc_io =
+(1L << GLIBTOP_PROC_IO_DISK_RCHAR) + (1L << GLIBTOP_PROC_IO_DISK_WCHAR) +
+(1L << GLIBTOP_PROC_IO_DISK_RBYTES) + (1L << GLIBTOP_PROC_IO_DISK_WBYTES);
+
+/* Init function. */
+
+void
+_glibtop_init_proc_io_s (glibtop *server)
+{
+	server->sysdeps.proc_io = _glibtop_sysdeps_proc_io;
+}
+
+/* Provides detailed information about a process. */
+
+void
+glibtop_get_proc_io_s (glibtop *server, glibtop_proc_io *buf, pid_t pid)
+{
+	char buffer [BUFSIZ], *p;
+    memset (buf, 0, sizeof (glibtop_proc_io));
+
+    if (server->os_version_code < LINUX_VERSION_CODE(2, 6, 20))
+      return;
+
+	if (proc_file_to_buffer(buffer, sizeof buffer, "/proc/%d/io", pid))
+		return;
+
+	p = skip_token (buffer);
+    buf->disk_rchar = g_ascii_strtoull (p, &p, 10);
+    p = skip_line (p);
+    p = skip_token (p);
+    buf->disk_wchar = g_ascii_strtoull (p, &p, 10);
+    p = skip_line (p);
+    p = skip_line (p);
+    p = skip_line (p);
+    p = skip_token (p);
+    buf->disk_rbytes = g_ascii_strtoull (p, &p, 10);
+    p = skip_line (p);
+    p = skip_token (p);
+    buf->disk_wbytes = g_ascii_strtoull (p, &p, 10);    
+
+    buf->flags = _glibtop_sysdeps_proc_io;
+}
diff --git a/sysdeps/stub/procio.c b/sysdeps/stub/procio.c
new file mode 100644
index 00000000..a4846aee
--- /dev/null
+++ b/sysdeps/stub/procio.c
@@ -0,0 +1,43 @@
+/* Copyright (C) 2017 Robert Roth
+   This file is part of LibGTop.
+
+   Contributed by Robert Roth <robert.roth.off@gmail.com>, February 2017.
+
+   LibGTop is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License,
+   or (at your option) any later version.
+
+   LibGTop is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with LibGTop; see the file COPYING. If not, write to the
+   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#include <config.h>
+#include <glibtop.h>
+#include <glibtop/procio.h>
+
+static const unsigned long _glibtop_sysdeps_proc_io = 0;
+
+/* Init function. */
+
+void
+_glibtop_init_proc_io_s (glibtop *server)
+{
+	server->sysdeps.proc_io = _glibtop_sysdeps_proc_io;
+}
+
+/* Provides detailed information about a process. */
+
+void
+glibtop_get_proc_io_s (glibtop *server, glibtop_proc_io *buf,
+			 pid_t pid)
+{
+	memset (buf, 0, sizeof (glibtop_proc_io));
+}
diff --git a/sysdeps/stub_suid/glibtop_server.h b/sysdeps/stub_suid/glibtop_server.h
index cf121212..15fe2e11 100644
--- a/sysdeps/stub_suid/glibtop_server.h
+++ b/sysdeps/stub_suid/glibtop_server.h
@@ -45,6 +45,7 @@ G_BEGIN_DECLS
 #define GLIBTOP_SUID_NETLOAD		(1 << GLIBTOP_SYSDEPS_NETLOAD)
 #define GLIBTOP_SUID_NETLIST		0
 #define GLIBTOP_SUID_PPP		(1 << GLIBTOP_SYSDEPS_PPP)
+#define GLIBTOP_SUID_PROC_IO	(1 << GLIBTOP_SYSDEPS_PROC_IO)
 
 G_END_DECLS